[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US6572295B1 - Method for making a writing or coloring pencil by triple extrusion and writing or coloring pencil comprising an intermediate protective layer - Google Patents

Method for making a writing or coloring pencil by triple extrusion and writing or coloring pencil comprising an intermediate protective layer Download PDF

Info

Publication number
US6572295B1
US6572295B1 US09/913,196 US91319602A US6572295B1 US 6572295 B1 US6572295 B1 US 6572295B1 US 91319602 A US91319602 A US 91319602A US 6572295 B1 US6572295 B1 US 6572295B1
Authority
US
United States
Prior art keywords
protective layer
lead
thermoplastic material
thermoplastic
pencil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US09/913,196
Inventor
Ludovic Chochoy
Hélène Baillieu
Jacques Bachelet
Lucien Foscarin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Conte SA
Original Assignee
Conte SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9553187&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US6572295(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Conte SA filed Critical Conte SA
Assigned to CONTE reassignment CONTE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BACHELET, JACQUES, BAILLIEU, HELENE, CHOCHOY, LUDOVIC, FOSCARIN, LUCIEN
Application granted granted Critical
Publication of US6572295B1 publication Critical patent/US6572295B1/en
Adjusted expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
    • B43K19/16—Making non-propelling pencils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2973—Particular cross section
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31924—Including polyene monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31928—Ester, halide or nitrile of addition polymer

Definitions

  • the present invention relates to a method of continuously manufacturing a writing pencil or a coloring crayon by simultaneously extruding thermoplastic materials constituting successively the “lead”, and the material surrounding the lead, referred to below as “wood” material by analogy with the composition of traditional pencils, where this material is indeed wood. More particularly, the invention relates to a triple extrusion method in which thermoplastic materials are extruded including an intermediate protective layer which is coextruded between the lead and the wood material. The invention also provides a pencil or a crayon suitable for being obtained by the method of the invention.
  • the intermediate protective layer is of non-expanded thermoplastic material compatible with the lead material and with the wood material and having a melting temperature which is equal to or greater than both the melting temperature of the lead material and that of the wood material.
  • That particular choice of thermoplastic material for constituting the intermediate protective layer is for the purpose of avoiding defects due to the presence, on the outer periphery of the lead material, of bubbles of the kind observed when manufacturing pencils by dual extrusion while using a foaming or expanding agent in the wood material. Because of its melting temperature, the thermoplastic material constituting the protective layer is less fluid than the lead and wood materials. As a result it does not deform under the effect of bubbles given off at the surface of the wood material and thus constitutes a protective barrier for the lead material.
  • the problem which the present invention seeks to solve is of a different kind. It likewise relates to continuously manufacturing a pencil or a crayon by coextrusion of thermoplastic materials. However the presence of another type of defect has been observed, namely cracking of the lead, giving rise to frequent breaks, in particular when sharpening the pencil.
  • the object of the Applicant is to propose a method of manufacture which mitigates the above-mentioned drawbacks, by avoiding the appearance of such cracking.
  • thermoplastic material constituting the protective layer is determined in such a manner as to remain deformable while the lead material is shrinking, during cooling.
  • thermoplastic material constituting the protective layer is preferably selected so that its solidification point is lower than the solidification point of the thermoplastic material constituting the lead material.
  • the lead material solidifies earlier than the protective layer since its solidification point (i.e. the temperature at which the previously plastic or molten thermoplastic material begins to become solid) is higher than that of the thermoplastic material constituting the protective layer.
  • the shrinkage of the lead material which occurs during solidification therefore takes place while the lead material is surrounded by the protective layer which has not yet solidified but which is still in a deformable state.
  • this protective layer allows the lead material to release its internal stresses and thus to shrink without cracks appearing. Solidification proper of the protective layer occurs subsequently.
  • the difference between the solidification points of the lead material and of the protective layer is preferably about 10° C. to 20° C.
  • an additive constituted either by a thermoplastic elastomer or else by an ethyl-vinyl-acetate copolymer (EVA).
  • EVA ethyl-vinyl-acetate copolymer
  • the invention also claims a pencil or crayon suitable for being obtained by the above-specified manufacturing method.
  • such a pencil is constituted by superposing a core made of a filled first thermoplastic material referred to as “lead material”, a protective layer made of a non-expanded thermoplastic material, and a layer constituting an expanded second thermoplastic material referred to as “wood” material.
  • the thermoplastic material constituting the protective layer has a solidification point which is lower than that of the thermoplastic material constituting the lead material.
  • the protective layer contains a thermoplastic elastomer or an ethyl-vinyl-acetate copolymer (EVA).
  • EVA ethyl-vinyl-acetate copolymer
  • the protective layer preferably comprises a styrene polymer.
  • the protective layer can comprise 70% to 95% of a styrene compound and 5% to 30% of a thermoplastic elastomer or an EVA copolymer.
  • thermoplastic material constituting the protective layer can be constituted by a material which does not solidify after cooling but which is deformable when hot and which remains flexible.
  • This can be a thermoplastic elastomer material, in particular.
  • FIG. 1 is a diagram showing the steps of the triple extrusion.
  • FIG. 2 is a perspective view of a pencil having a flexible protective layer in accordance with the invention.
  • FIG. 1 does no more than outline triple extrusion of three layers of thermoplastic material respectively comprising a central core, an intermediate layer, and an outer layer.
  • the central core constitutes the lead material 1
  • the intermediate layer constitutes the protective layer 2
  • the outer layer constitutes the wood material 3 of a continuously manufactured pencil 4 .
  • thermoplastic materials are determined so that each corresponding element has the expected properties: the pencil as a whole must be easy to sharpen and of density close to that of a traditional pencil made of wood.
  • the lead material must include fillers for marking purposes that can easily be transferred onto a writing or coloring medium so as to provide good covering power.
  • the corresponding components can be selected from those described in document FR 1 588 294.
  • the wood material contains an expander agent, e.g. azo-dicarbonamide.
  • the protective layer 2 has no expanding agent and needs to be compatible both with the lead material 1 and with the wood material 2 so that the lead is held properly in the pencil.
  • the material constituting the protective layer is selected to have a solidification point which is lower, and indeed considerably lower, than that of the thermoplastic material constituting the lead.
  • the solidification point is also commonly referred to as the softening point. It is the temperature (or temperature zone) from which material in the plastic or molten state begins to solidify. It also the temperature (or temperature zone) from which thermoplastic material in the solid state begins to soften. It is also referred to as the VICAT point.
  • the lead material 1 solidifies more quickly than the protective layer. It is during this solidification that a shrinkage phenomenon occurs, thereby developing internal stresses in the lead material, which stresses are a function of the composition of the lead material and of its diameter.
  • the lead material solidifies while the protective layer has not yet begun to solidify, and is still in a deformable state (semisolid or in any event flexible). As a result, the material constituting the protective layer will accompany the shrinkage of the lead material by deforming, thereby preventing cracks appearing subsequently.
  • the function of the protective layer is to compensate for the difference between the shrinkage coefficients of the thermoplastic materials constituting the lead material and the wood material, while nevertheless providing mechanical connection between these two materials once the pencil has solidified completely. It is important for mechanical connection to remain between the lead and the remainder of the pencil.
  • the protective layer is preferably at least 0.5 mm thick and can reinforce the lead material, ensuring that the lead consolidates in such a manner as to significantly reduce the risk of breaking when the pencil is in use.
  • the, protective layer when using a wood material that includes an expanding agent, it is desirable for the, protective layer also to perform the function attributed thereto in document EP 0 505 262, namely that of forming a barrier to protect the lead material against the diffusion of bubbles coming from the wood material.
  • the thermoplastic material constituting the protective layer (which does not have an expanding agent and which is compatible both with the lead material and with the wood material) has a melting temperature which is equal to or greater than both the melting temperature of the lead material and that of the wood material.
  • This example relates to a writing or drawing pencil 4 having a soft graphite lead.
  • the composition of the lead material 1 is as follows:
  • polystyrene methacrylate copolymer 20%-25% plasticizer: 15% carbon black: 55% gas black: 5% zinc stearate: 0.5% talc: 4.5%
  • composition of the protective layer 2 is as follows:
  • styrene polymer 80% ethyl-vinyl-acetate copolymer (EVA): 20%
  • composition of the wood material 3 is as follows:
  • polystyrene methacrylate copolymer 78.5%
  • phthlate type plasticizer 10% sawdust: 10% pigments (masterbatch) 1.5%
  • the wood material has about 2% of a masterbatch containing azo-dicarbonamide as an expanding agent mixed therewith.
  • the protective layer can also be tinted with a masterbatch so that the protective layer 2 has the same color as the wood material 3 or it can be tinted in some other color so as to make it more visible.
  • methyacrylate 100° C. to 110° C.
  • high-impact polystyrene 92° C. to 95° C.
  • EVA copolymer 40° C. to 44° C.
  • the presence of the EVA copolymer serves to lower the solidification point of the protective layer relative to the lead material and to the wood material.
  • thermoplastic elastomer instead of the EVA copolymer, for example of the styrene butadiene styrene (SBS) type having hardness on the Shore scale of 50 to 70.
  • SBS styrene butadiene styrene
  • a hexagonal pencil 4 is obtained which, once sharpened (FIG. 2 ), reveals the protective layer 2 between the lead material and the wood material 3 , and in this case the protective layer has a thickness of 0.3 mm for a pencil 4 having a distance of about 7 mm between flats and having a lead with a diameter of about 2 mm.
  • This example relates to a soft coloring crayon 4 .
  • the wood material 3 is unchanged.
  • composition of the lead material 1 is as follows:
  • polystyrene methacrylate copolymer 25% phthlate type plasticizer: 15% colored pigments: 25% zinc stearate: 0.5% talc: 34.5%
  • composition of the protective layer 2 is as follows:
  • styrene polymer 83% ethyl-vinyl-acetate copolymer (EVA): 15% pigment (masterbatch): 2%
  • the composition of the protective layer 2 would be as follows:
  • thermoplastic elastomer 10% pigment (masterbatch): 2%
  • the present invention is not limited to the embodiments described above as non-exhaustive examples. It is possible to use base components for the lead material and for the wood material other than a polystyrene methacrylate copolymer. Furthermore, it is possible to give the pencil any other type of shape, without being limited to a hexagonal shape. It can be circular, triangular, octagonal, without this list being exhaustive. It is also possible for the protective layer to comprise a thermoplastic material which is not only deformable when hot (while the lead is shrinking) but which does not solidify and which remains flexible after the pencil has solidified completely, e.g. based on thermoplastic elastomer.

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

The method of continuously manufacturing pencils or crayons consists in coextruding a filled first thermoplastic material referred to as “lead” material, and around it both an intermediate “protective” layer of a thermoplastic material having no expanding agent and a second thermoplastic material containing an expanding agent and referred to as “wood” material, and in cooling said coextruded thermoplastic materials. According to the invention, the thermoplastic material constituting the protective layer is determined so that during cooling it remains deformable while the lead material shrinks. The pencil is constituted by superposing a core of a filled first thermoplastic material referred to as “lead” material, a protective layer of a non-expanded thermoplastic material, and a layer of an expanded second thermoplastic material referred to as “wood” material. According to the invention, the thermoplastic material constituting the protective layer has a solidification point which is lower than that of the thermoplastic material constituting the lead material.

Description

The present invention relates to a method of continuously manufacturing a writing pencil or a coloring crayon by simultaneously extruding thermoplastic materials constituting successively the “lead”, and the material surrounding the lead, referred to below as “wood” material by analogy with the composition of traditional pencils, where this material is indeed wood. More particularly, the invention relates to a triple extrusion method in which thermoplastic materials are extruded including an intermediate protective layer which is coextruded between the lead and the wood material. The invention also provides a pencil or a crayon suitable for being obtained by the method of the invention.
BACKGROUND OF THE INVENTION
Continuous manufacture of a pencil or a crayon by coextruding thermoplastic materials constituting the lead material, an intermediate protective layer, and the wood material is already known from document EP 0 505 262. In that document, the intermediate protective layer is of non-expanded thermoplastic material compatible with the lead material and with the wood material and having a melting temperature which is equal to or greater than both the melting temperature of the lead material and that of the wood material. That particular choice of thermoplastic material for constituting the intermediate protective layer is for the purpose of avoiding defects due to the presence, on the outer periphery of the lead material, of bubbles of the kind observed when manufacturing pencils by dual extrusion while using a foaming or expanding agent in the wood material. Because of its melting temperature, the thermoplastic material constituting the protective layer is less fluid than the lead and wood materials. As a result it does not deform under the effect of bubbles given off at the surface of the wood material and thus constitutes a protective barrier for the lead material.
OBJECTS AND SUMMARY OF THE INVENTION
The problem which the present invention seeks to solve is of a different kind. It likewise relates to continuously manufacturing a pencil or a crayon by coextrusion of thermoplastic materials. However the presence of another type of defect has been observed, namely cracking of the lead, giving rise to frequent breaks, in particular when sharpening the pencil.
The object of the Applicant is to propose a method of manufacture which mitigates the above-mentioned drawbacks, by avoiding the appearance of such cracking.
This object is achieved by the method of the invention. It is a method of continuously manufacturing pencils or crayons which consists in coextruding a filled first thermoplastic material referred to as “lead” material, and around this both an intermediate “protective” layer in a thermoplastic material that is free from any expanding agent, and a second thermoplastic material containing an expanding agent and referred to as “wood” material, and in cooling said coextruded thermoplastic materials.
In a manner characteristic of the invention, the thermoplastic material constituting the protective layer is determined in such a manner as to remain deformable while the lead material is shrinking, during cooling.
From the observations that the Applicant has made, it appears that cracking occurs mainly when the thermoplastic materials used for the lead material have a high coefficient of expansion giving rise, during cooling, to significant amount of longitudinal and transverse shrinkage. This applies in particular to the lead materials used in manufacturing soft lead pencils.
The thermoplastic material constituting the protective layer is preferably selected so that its solidification point is lower than the solidification point of the thermoplastic material constituting the lead material.
Thus, while the extruded materials are cooling, possibly after they have been cut transversely so as to give rise to individual pencils, the lead material solidifies earlier than the protective layer since its solidification point (i.e. the temperature at which the previously plastic or molten thermoplastic material begins to become solid) is higher than that of the thermoplastic material constituting the protective layer. The shrinkage of the lead material which occurs during solidification therefore takes place while the lead material is surrounded by the protective layer which has not yet solidified but which is still in a deformable state. By means of its deformability and its flexibility, this protective layer allows the lead material to release its internal stresses and thus to shrink without cracks appearing. Solidification proper of the protective layer occurs subsequently.
The difference between the solidification points of the lead material and of the protective layer is preferably about 10° C. to 20° C.
In order to lower the solidification point of the protective layer, it is preferable to use an additive constituted either by a thermoplastic elastomer or else by an ethyl-vinyl-acetate copolymer (EVA).
The invention also claims a pencil or crayon suitable for being obtained by the above-specified manufacturing method.
In known manner, such a pencil is constituted by superposing a core made of a filled first thermoplastic material referred to as “lead material”, a protective layer made of a non-expanded thermoplastic material, and a layer constituting an expanded second thermoplastic material referred to as “wood” material. In characteristic manner, the thermoplastic material constituting the protective layer has a solidification point which is lower than that of the thermoplastic material constituting the lead material.
Advantageously, the protective layer contains a thermoplastic elastomer or an ethyl-vinyl-acetate copolymer (EVA).
As its thermoplastic material, the protective layer preferably comprises a styrene polymer. For example, the protective layer can comprise 70% to 95% of a styrene compound and 5% to 30% of a thermoplastic elastomer or an EVA copolymer.
It is also possible for the thermoplastic material constituting the protective layer to be constituted by a material which does not solidify after cooling but which is deformable when hot and which remains flexible. This can be a thermoplastic elastomer material, in particular.
BRIEF DESCRIPTION OF THE DRAWING
The present invention will be better understood on reading the following description of a version of the method of manufacturing a pencil or a crayon by triple extrusion of thermoplastic materials, and of a pencil having three successive layers as obtained in this way and as shown in the accompanying drawing, in which:
FIG. 1 is a diagram showing the steps of the triple extrusion; and
FIG. 2 is a perspective view of a pencil having a flexible protective layer in accordance with the invention.
MORE DETAILED DESCRIPTION
Multiple extrusion techniques are well known to the person skilled in the art. By way of example, the materials used are of the type described in document FR 2 099 248 for dual extrusion as applied to continuously manufacturing pencils. As a result, FIG. 1 does no more than outline triple extrusion of three layers of thermoplastic material respectively comprising a central core, an intermediate layer, and an outer layer.
In the context of the present invention, the central core constitutes the lead material 1, the intermediate layer constitutes the protective layer 2, and the outer layer constitutes the wood material 3 of a continuously manufactured pencil 4.
The composition of the thermoplastic materials is determined so that each corresponding element has the expected properties: the pencil as a whole must be easy to sharpen and of density close to that of a traditional pencil made of wood. The lead material must include fillers for marking purposes that can easily be transferred onto a writing or coloring medium so as to provide good covering power. By way of example, the corresponding components can be selected from those described in document FR 1 588 294.
In order to obtain the desired density, the wood material contains an expander agent, e.g. azo-dicarbonamide. The protective layer 2 has no expanding agent and needs to be compatible both with the lead material 1 and with the wood material 2 so that the lead is held properly in the pencil. The material constituting the protective layer is selected to have a solidification point which is lower, and indeed considerably lower, than that of the thermoplastic material constituting the lead.
The solidification point is also commonly referred to as the softening point. It is the temperature (or temperature zone) from which material in the plastic or molten state begins to solidify. It also the temperature (or temperature zone) from which thermoplastic material in the solid state begins to soften. It is also referred to as the VICAT point.
While the pencil 4 constituted by the three coextruded layers 1, 2, and 3 is cooling, the lead material 1 solidifies more quickly than the protective layer. It is during this solidification that a shrinkage phenomenon occurs, thereby developing internal stresses in the lead material, which stresses are a function of the composition of the lead material and of its diameter. In the invention, the lead material solidifies while the protective layer has not yet begun to solidify, and is still in a deformable state (semisolid or in any event flexible). As a result, the material constituting the protective layer will accompany the shrinkage of the lead material by deforming, thereby preventing cracks appearing subsequently.
It is during the manufacture of soft lead pencils or crayons that the largest concentration of such cracks are to be found in the lead. In observations made by the Applicant, soft leads have a higher coefficient of expansion which leads to a larger shrinkage phenomenon. In the concept of the present invention, the function of the protective layer is to compensate for the difference between the shrinkage coefficients of the thermoplastic materials constituting the lead material and the wood material, while nevertheless providing mechanical connection between these two materials once the pencil has solidified completely. It is important for mechanical connection to remain between the lead and the remainder of the pencil.
The softer the structure of the lead, the poorer its mechanical strength, and in particular it breaks easily in response to bending. To compensate this loss of mechanical strength, the diameter of the lead within the pencil is increased, which has the effect of giving rise to a corresponding increase in the shrinkage phenomenon and of the need to implement the protective layer of the invention. Under such circumstances, the protective layer is preferably at least 0.5 mm thick and can reinforce the lead material, ensuring that the lead consolidates in such a manner as to significantly reduce the risk of breaking when the pencil is in use.
Naturally, when using a wood material that includes an expanding agent, it is desirable for the, protective layer also to perform the function attributed thereto in document EP 0 505 262, namely that of forming a barrier to protect the lead material against the diffusion of bubbles coming from the wood material. Under such circumstances, the thermoplastic material constituting the protective layer (which does not have an expanding agent and which is compatible both with the lead material and with the wood material) has a melting temperature which is equal to or greater than both the melting temperature of the lead material and that of the wood material.
EXAMPLE 1
This example relates to a writing or drawing pencil 4 having a soft graphite lead. The composition of the lead material 1 is as follows:
polystyrene methacrylate copolymer: 20%-25%
plasticizer: 15%
carbon black: 55%
gas black:  5%
zinc stearate: 0.5% 
talc: 4.5% 
The composition of the protective layer 2 is as follows:
styrene polymer: 80%
ethyl-vinyl-acetate copolymer (EVA): 20%
The composition of the wood material 3 is as follows:
polystyrene methacrylate copolymer: 78.5%  
phthlate type plasticizer: 10%
sawdust: 10%
pigments (masterbatch) 1.5% 
Just before extrusion, the wood material has about 2% of a masterbatch containing azo-dicarbonamide as an expanding agent mixed therewith.
The protective layer can also be tinted with a masterbatch so that the protective layer 2 has the same color as the wood material 3 or it can be tinted in some other color so as to make it more visible.
The solidification points or VICAT A points (ISO 306) for the various thermoplastic components mentioned above are as follows:
methyacrylate: 100° C. to 110° C.
high-impact polystyrene: 92° C. to 95° C.
ABS 104° C. to 110° C.
EVA copolymer: 40° C. to 44° C.
The presence of the EVA copolymer, even in small quantity, serves to lower the solidification point of the protective layer relative to the lead material and to the wood material.
The same effect can be obtained by using a thermoplastic elastomer instead of the EVA copolymer, for example of the styrene butadiene styrene (SBS) type having hardness on the Shore scale of 50 to 70.
After triple extrusion and passing continuously through the shaping die 5, a hexagonal pencil 4 is obtained which, once sharpened (FIG. 2), reveals the protective layer 2 between the lead material and the wood material 3, and in this case the protective layer has a thickness of 0.3 mm for a pencil 4 having a distance of about 7 mm between flats and having a lead with a diameter of about 2 mm.
EXAMPLE 2
This example relates to a soft coloring crayon 4.
The wood material 3 is unchanged.
The composition of the lead material 1 is as follows:
polystyrene methacrylate copolymer: 25%
phthlate type plasticizer: 15%
colored pigments: 25%
zinc stearate: 0.5% 
talc: 34.5%  
The composition of the protective layer 2 is as follows:
styrene polymer: 83%
ethyl-vinyl-acetate copolymer (EVA): 15%
pigment (masterbatch):  2%
When using a thermoplastic elastomer of the SBS type, the composition of the protective layer 2 would be as follows:
styrene polymer: 88%
thermoplastic elastomer: 10%
pigment (masterbatch):  2%
The present invention is not limited to the embodiments described above as non-exhaustive examples. It is possible to use base components for the lead material and for the wood material other than a polystyrene methacrylate copolymer. Furthermore, it is possible to give the pencil any other type of shape, without being limited to a hexagonal shape. It can be circular, triangular, octagonal, without this list being exhaustive. It is also possible for the protective layer to comprise a thermoplastic material which is not only deformable when hot (while the lead is shrinking) but which does not solidify and which remains flexible after the pencil has solidified completely, e.g. based on thermoplastic elastomer.

Claims (11)

What is claimed is:
1. A method of continuously manufacturing pencils or crayons by simultaneous coextrusion, the method consisting in coextruding a filled first thermoplastic material referred to as “lead” material, and around it both an intermediate “protective” layer of a thermoplastic material having no expanding agent, and a second thermoplastic material containing an expanding agent and referred to as “wood” material, and in cooling said coextruded thermoplastic materials, wherein the thermoplastic material constituting the protective layer is determined so that during cooling it remains deformable while the lead material shrinks.
2. A method according to claim 1 for manufacturing pencils in which the lead material has a high coefficient of expansion, in particular soft lead pencils.
3. A method according to claim 1, wherein the solidification point of the thermoplastic material constituting the protective layer is lower than the solidification point of the thermoplastic material constituting the lead material.
4. A method according to claim 3, wherein the difference between the solidification points of the lead material and of the protective layer is about 10° C. to 20° C.
5. A method according to claim 3, wherein to lower the solidification point of the protective layer, an additive is used constituted either by a thermoplastic elastomer or by an ethylene-vinyl-acetate copolymer (EVA).
6. A pencil obtained by simultaneous coextrusion, the pencil being constituted by superposing a core made of a filled first thermoplastic material referred to as “lead” material, a protective layer of a non-expanded thermoplastic material, and a layer of an expanded second thermoplastic material referred to as “wood” material, wherein the thermoplastic material constituting the protective layer has a solidification point which is lower than the solidification point of the thermoplastic material constituting the lead material.
7. A pencil according to claim 5, wherein the protective layer contains a thermoplastic elastomer or an ethyl-vinyl-acetate copolymer (EVA).
8. A pencil according to claim 6, wherein the protective layer comprises a styrene polymer as its thermoplastic material.
9. A pencil according to claim 7, wherein the protective layer comprises 70% to 95% of a styrene compound and 5% to 30% of a thermoplastic elastomer or an ethyl-vinyl-acetate copolymer.
10. A pencil according to claim 6, constituted by superposing a core of a filled first thermoplastic material referred to as “lead” material, a protective layer of a non-expanded thermoplastic material, and a layer of an expanded second thermoplastic material referred to as “wood” material, wherein the protective layer is deformable when hot and remains flexible after cooling.
11. A pencil according to claim 10, wherein the protective layer is made of a thermoplastic elastomer.
US09/913,196 1999-12-13 2000-11-29 Method for making a writing or coloring pencil by triple extrusion and writing or coloring pencil comprising an intermediate protective layer Expired - Lifetime US6572295B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9915696 1999-12-13
FR9915696A FR2802148B1 (en) 1999-12-13 1999-12-13 PROCESS FOR THE MANUFACTURE BY TRI-EXTRUSION OF A PENCIL TO BE WRITING OR TO BE COLORED AND THE PENCIL TO BE WRITING OR TO BE COLORED COMPRISING A PROTECTIVE INTERMEDIATE LAYER
PCT/FR2000/003334 WO2001043987A1 (en) 1999-12-13 2000-11-29 Method for making a writing or colouring pencil by triple extrusion and writing or colouring pencil comprising an intermediate protective layer

Publications (1)

Publication Number Publication Date
US6572295B1 true US6572295B1 (en) 2003-06-03

Family

ID=9553187

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/913,196 Expired - Lifetime US6572295B1 (en) 1999-12-13 2000-11-29 Method for making a writing or coloring pencil by triple extrusion and writing or coloring pencil comprising an intermediate protective layer

Country Status (18)

Country Link
US (1) US6572295B1 (en)
EP (1) EP1150847B1 (en)
JP (1) JP4934260B2 (en)
AR (1) AR030173A1 (en)
AT (1) ATE358029T1 (en)
AU (1) AU2180301A (en)
BR (1) BR0007874A (en)
CA (1) CA2362775C (en)
DE (1) DE60034108T2 (en)
DZ (1) DZ3144A1 (en)
EG (1) EG23174A (en)
ES (1) ES2284550T3 (en)
FR (1) FR2802148B1 (en)
HK (1) HK1043769B (en)
MA (1) MA25343A1 (en)
MX (1) MXPA01008169A (en)
PT (1) PT1150847E (en)
WO (1) WO2001043987A1 (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070243006A1 (en) * 2005-04-16 2007-10-18 Kathleen Torrell Liquid graphite
EP1685977A3 (en) * 2005-01-26 2008-07-02 J.S. Staedtler GmbH & Co KG Pencil lead for writing, drawing and painting instruments
US20100003061A1 (en) * 2006-09-29 2010-01-07 Thies Andreas Writing, drawing, painting and /or cosmetics pencil and method of producing the same
US20100279111A1 (en) * 2007-11-16 2010-11-04 Ems-Patent Ag Filled polyamide molding materials
US20110129284A1 (en) * 2008-07-15 2011-06-02 J.S. Staedtler Gmbh & Co. Kg Writing, drawing, decorating or cosmetic pencil
US20110220667A1 (en) * 2010-03-12 2011-09-15 Ems-Patent Ag Impact-resistant modified polyamide moulding compound and container formed therefrom
US20120237708A1 (en) * 2011-03-17 2012-09-20 Ems-Patent Ag Casing body
US8604120B2 (en) 2010-07-30 2013-12-10 Ems-Patent Ag Polyamide moulding compound for producing moulded articles with a soft-touch surface and also corresponding moulded articles
CN103732415A (en) * 2011-07-28 2014-04-16 J.S.斯达德勒两合公司 Writing, drawing, painting or cosmetic device comprising a honeycomb body, and method for producing the honeycomb body or the device comprising a honeycomb body
CN103818152A (en) * 2014-02-26 2014-05-28 闫化存 Novel pencil and use method thereof
WO2014185935A1 (en) * 2013-05-13 2014-11-20 Hemant Patel Process and formulation for a plastic pencil
EP2845747A1 (en) * 2013-09-09 2015-03-11 Kabushiki Kaisha Pilot Corporation Thermochromic solid writing instrument
US9109115B2 (en) 2013-03-15 2015-08-18 Ems-Patent Ag Polyamide moulding compound and moulded articles produced herefrom
US9133322B2 (en) 2012-10-02 2015-09-15 Ems-Patent Ag Polyamide moulding compounds and use thereof in the production of moulded articles
US20150367673A1 (en) * 2013-01-23 2015-12-24 J.S. Staedtler Gmbh & Co. Kg Component for writing, drawing, painting and/or cosmetic implements and method for the production thereof
US9453106B2 (en) 2012-05-23 2016-09-27 Ems-Patent Ag Scratch-resistant, transparent and tough copolyamide moulding compounds, moulded articles produced therefrom and uses thereof
US20170232782A1 (en) * 2014-07-02 2017-08-17 Staedtler Mars Gmbh & Co. Kg Writing, drawing, marking and/or painting utensil or cosmetics implement or input device for contact-sensitive surfaces, and method for producing the same
US9963591B2 (en) 2012-12-18 2018-05-08 Ems-Patent Ag Polyamide molding material and moldings manufactured from same
US9988546B2 (en) 2014-12-17 2018-06-05 Conte Colour pencil lead
US10308063B2 (en) 2014-12-17 2019-06-04 Conte Paper pencil lead
US10316208B2 (en) * 2014-12-17 2019-06-11 Conte Pencil for writing or colouring
US20190322120A1 (en) * 2016-06-21 2019-10-24 Conte Writing or coloring pencil
WO2020127203A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2020127341A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2020127320A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2020127209A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2022069371A1 (en) 2020-09-30 2022-04-07 Societe Bic Improved coloring pencil lead for synthetic pencil based on biopolymers blends

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011103995U1 (en) 2011-07-28 2012-11-15 J. S. Staedtler Gmbh & Co. Kg Writing, drawing, painting or cosmetic device comprising a honeycomb body
FR2988643B1 (en) 2012-03-28 2014-03-07 Maped EXPANDED CRAYON AND METHOD FOR MANUFACTURING THE SAME
JP6033745B2 (en) * 2013-07-31 2016-11-30 株式会社パイロットコーポレーション Solid cursive
JP6067406B2 (en) * 2013-02-18 2017-01-25 株式会社パイロットコーポレーション Solid cursive
WO2014126231A1 (en) 2013-02-18 2014-08-21 株式会社パイロットコーポレーション Solid writing material
JP6067472B2 (en) * 2013-04-30 2017-01-25 株式会社パイロットコーポレーション Solid cursive
FR3065006B1 (en) 2017-04-10 2019-06-21 Societe Bic PENCIL MINE WITH PAPER
EP3845616A1 (en) 2020-01-06 2021-07-07 Société BIC Lead for pencil for writing, drawing, marking, plotting and/or coloring

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR969976A (en) 1948-07-01 1950-12-28 Making a pencil with a lead and synthetic plastics
US3875088A (en) * 1971-07-16 1975-04-01 Hasbro Industries Inc Pencil sheath compositions
US4176978A (en) * 1977-01-26 1979-12-04 Jindrich Lorenz Pencil sheath and composition therefor
US4413921A (en) * 1978-09-05 1983-11-08 Revlon, Inc. Cosmetic pencil having a sharpenable polyethylene casing
US5244297A (en) 1991-03-19 1993-09-14 Conte S.A. Process for manufacturing pencil by tri-extrusion and the produced pencil having an intermediate protective casing
DE4438038A1 (en) * 1994-10-25 1996-05-02 Nele Kosmetik Gmbh Structure for lead of cosmetic pencil
US5531947A (en) 1992-09-15 1996-07-02 Bellaform Extrusionstechnik Gmbh Process and installation for the manufacture of pencils
US5549779A (en) 1991-07-20 1996-08-27 Schwan-Stabilo Schwanhaeusser Gmbh & Co. Process for the production of a pencil
US5904970A (en) * 1997-06-13 1999-05-18 Nomaco, Inc. Integrally bonded, multilayer foamed product
DE19855325A1 (en) * 1997-12-02 1999-06-10 Faber Castell A W Outer casing material for color, lead and cosmetic pencils
US20030022962A1 (en) * 2001-03-06 2003-01-30 Cook David G. Composition for extruded pencil casings, and pencil casings and pencils made therefrom

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1561767B1 (en) 1967-10-04 1972-07-06 Bayer Ag Pen
DE2030578A1 (en) 1970-06-20 1971-12-30 Bayer Method and device for the continuous production and / or wrapping of extruded profiles
JPS5716500Y2 (en) * 1976-10-18 1982-04-06
JPS5358077A (en) * 1976-11-02 1978-05-25 Sumitomo Light Metal Ind Manufacture of expansible material having solid appearance
JPH0695185B2 (en) * 1986-01-13 1994-11-24 セイコーエプソン株式会社 Negative type liquid crystal display device and large-sized display device
JPH0346672Y2 (en) * 1986-04-08 1991-10-02
FR2674179B1 (en) 1991-03-19 1994-11-10 Conte PROCESS OF MANUFACTURING BY TRI-EXTRUSION OF A PENCIL TO BE WRITTEN OR TO COLORED AND PENCIL TO BE WRITTEN OR TO COLORED COMPRISING AN INTERMEDIATE SHELL FOR PROTECTING THE MINE.

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR969976A (en) 1948-07-01 1950-12-28 Making a pencil with a lead and synthetic plastics
US3875088A (en) * 1971-07-16 1975-04-01 Hasbro Industries Inc Pencil sheath compositions
US4176978A (en) * 1977-01-26 1979-12-04 Jindrich Lorenz Pencil sheath and composition therefor
US4413921A (en) * 1978-09-05 1983-11-08 Revlon, Inc. Cosmetic pencil having a sharpenable polyethylene casing
US5244297A (en) 1991-03-19 1993-09-14 Conte S.A. Process for manufacturing pencil by tri-extrusion and the produced pencil having an intermediate protective casing
US5549779A (en) 1991-07-20 1996-08-27 Schwan-Stabilo Schwanhaeusser Gmbh & Co. Process for the production of a pencil
US5531947A (en) 1992-09-15 1996-07-02 Bellaform Extrusionstechnik Gmbh Process and installation for the manufacture of pencils
DE4438038A1 (en) * 1994-10-25 1996-05-02 Nele Kosmetik Gmbh Structure for lead of cosmetic pencil
US5904970A (en) * 1997-06-13 1999-05-18 Nomaco, Inc. Integrally bonded, multilayer foamed product
DE19855325A1 (en) * 1997-12-02 1999-06-10 Faber Castell A W Outer casing material for color, lead and cosmetic pencils
US20030022962A1 (en) * 2001-03-06 2003-01-30 Cook David G. Composition for extruded pencil casings, and pencil casings and pencils made therefrom

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1810520B (en) * 2005-01-26 2011-04-06 J.S.斯达德勒两合公司 Pencil lead for writing, drawing and painting instruments
EP1685977A3 (en) * 2005-01-26 2008-07-02 J.S. Staedtler GmbH & Co KG Pencil lead for writing, drawing and painting instruments
US20070243006A1 (en) * 2005-04-16 2007-10-18 Kathleen Torrell Liquid graphite
US7951236B2 (en) 2005-04-16 2011-05-31 Jakks Pacific, Inc. Liquid graphite
US8845220B2 (en) * 2006-09-29 2014-09-30 J.S. Staedtler Gmbh & Co. Kg Writing, drawing, painting and /or cosmetics pencil and method of producing the same
US20100003061A1 (en) * 2006-09-29 2010-01-07 Thies Andreas Writing, drawing, painting and /or cosmetics pencil and method of producing the same
US8586662B2 (en) 2007-11-16 2013-11-19 Ems-Patent Ag Filled polyamide molding materials
US20100279111A1 (en) * 2007-11-16 2010-11-04 Ems-Patent Ag Filled polyamide molding materials
US8747003B2 (en) * 2008-07-15 2014-06-10 J.S. Staedtler Gmbh & Co. Kg Writing, drawing, decorating or cosmetic pencil
US20110129284A1 (en) * 2008-07-15 2011-06-02 J.S. Staedtler Gmbh & Co. Kg Writing, drawing, decorating or cosmetic pencil
US20110220667A1 (en) * 2010-03-12 2011-09-15 Ems-Patent Ag Impact-resistant modified polyamide moulding compound and container formed therefrom
US8404323B2 (en) 2010-03-12 2013-03-26 Ems-Patent Ag Impact-resistant modified polyamide moulding compound and container formed therefrom
US8604120B2 (en) 2010-07-30 2013-12-10 Ems-Patent Ag Polyamide moulding compound for producing moulded articles with a soft-touch surface and also corresponding moulded articles
KR101495095B1 (en) * 2011-03-17 2015-02-23 이엠에스-패턴트 에이지 Casing body
US20120237708A1 (en) * 2011-03-17 2012-09-20 Ems-Patent Ag Casing body
CN103732415A (en) * 2011-07-28 2014-04-16 J.S.斯达德勒两合公司 Writing, drawing, painting or cosmetic device comprising a honeycomb body, and method for producing the honeycomb body or the device comprising a honeycomb body
US9579865B2 (en) 2011-07-28 2017-02-28 Staedtler Mars Gmbh & Co. Kg Writing, drawing, painting or cosmetic device comprising a honeycomb body, and method for producing the honeycomb body or the device comprising a honeycomb body
US9453106B2 (en) 2012-05-23 2016-09-27 Ems-Patent Ag Scratch-resistant, transparent and tough copolyamide moulding compounds, moulded articles produced therefrom and uses thereof
US9133322B2 (en) 2012-10-02 2015-09-15 Ems-Patent Ag Polyamide moulding compounds and use thereof in the production of moulded articles
US9963591B2 (en) 2012-12-18 2018-05-08 Ems-Patent Ag Polyamide molding material and moldings manufactured from same
US20150367673A1 (en) * 2013-01-23 2015-12-24 J.S. Staedtler Gmbh & Co. Kg Component for writing, drawing, painting and/or cosmetic implements and method for the production thereof
US9862226B2 (en) * 2013-01-23 2018-01-09 Staedtler Mars Gmbh & Co. Kg Component for writing, drawing, painting and/or cosmetic implements and method for the production thereof
US9109115B2 (en) 2013-03-15 2015-08-18 Ems-Patent Ag Polyamide moulding compound and moulded articles produced herefrom
WO2014185935A1 (en) * 2013-05-13 2014-11-20 Hemant Patel Process and formulation for a plastic pencil
CN104417151A (en) * 2013-09-09 2015-03-18 株式会社百乐 Thermochromic Solid Writing Instrument
EP2845747A1 (en) * 2013-09-09 2015-03-11 Kabushiki Kaisha Pilot Corporation Thermochromic solid writing instrument
CN103818152B (en) * 2014-02-26 2017-05-17 杨璨然 Use method of novel pencil
CN106956536A (en) * 2014-02-26 2017-07-18 闫化存 Powder bed, novel pencil and its application method applied to novel pencil
CN103818152A (en) * 2014-02-26 2014-05-28 闫化存 Novel pencil and use method thereof
CN106956536B (en) * 2014-02-26 2018-11-13 江苏宁江文化科技有限公司 Powder bed, novel pencil and its application method applied to novel pencil
US20170232782A1 (en) * 2014-07-02 2017-08-17 Staedtler Mars Gmbh & Co. Kg Writing, drawing, marking and/or painting utensil or cosmetics implement or input device for contact-sensitive surfaces, and method for producing the same
US10549570B2 (en) 2014-07-02 2020-02-04 Staedtler Mars Gmbh & Co. Kg Writing, drawing, marking and/or painting utensil or cosmetics implement or input device for contact-sensitive surfaces, and method for producing the same
US10059142B2 (en) * 2014-07-02 2018-08-28 Staedtler Mars Gmbh & Co. Kg Writing, drawing, marking and/or painting utensil or cosmetics implement or input device for contact-sensitive surfaces, and method for producing the same
US10308063B2 (en) 2014-12-17 2019-06-04 Conte Paper pencil lead
US10316208B2 (en) * 2014-12-17 2019-06-11 Conte Pencil for writing or colouring
US9988546B2 (en) 2014-12-17 2018-06-05 Conte Colour pencil lead
US20190322120A1 (en) * 2016-06-21 2019-10-24 Conte Writing or coloring pencil
US10814665B2 (en) * 2016-06-21 2020-10-27 Conte Writing or coloring pencil
WO2020127209A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2020127320A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2020127341A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2020127203A1 (en) 2018-12-18 2020-06-25 Societe Bic Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
US11485165B2 (en) * 2018-12-18 2022-11-01 SOCIéTé BIC Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
US11524518B2 (en) 2018-12-18 2022-12-13 SOCIéTé BIC Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
US11865855B2 (en) 2018-12-18 2024-01-09 SOCIéTé BIC Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
US12070966B2 (en) 2018-12-18 2024-08-27 SOCIéTé BIC Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
WO2022069371A1 (en) 2020-09-30 2022-04-07 Societe Bic Improved coloring pencil lead for synthetic pencil based on biopolymers blends

Also Published As

Publication number Publication date
MA25343A1 (en) 2001-12-31
MXPA01008169A (en) 2004-04-05
DZ3144A1 (en) 2001-06-21
FR2802148B1 (en) 2003-01-24
JP4934260B2 (en) 2012-05-16
AU2180301A (en) 2001-06-25
EP1150847A1 (en) 2001-11-07
CA2362775C (en) 2007-01-30
HK1043769B (en) 2007-09-28
DE60034108D1 (en) 2007-05-10
ES2284550T3 (en) 2007-11-16
HK1043769A1 (en) 2002-09-27
CA2362775A1 (en) 2001-06-21
ATE358029T1 (en) 2007-04-15
PT1150847E (en) 2007-06-21
AR030173A1 (en) 2003-08-13
FR2802148A1 (en) 2001-06-15
EG23174A (en) 2004-06-30
DE60034108T2 (en) 2007-12-06
WO2001043987A1 (en) 2001-06-21
EP1150847B1 (en) 2007-03-28
JP2003516888A (en) 2003-05-20
BR0007874A (en) 2001-10-16

Similar Documents

Publication Publication Date Title
US6572295B1 (en) Method for making a writing or coloring pencil by triple extrusion and writing or coloring pencil comprising an intermediate protective layer
EP1091852B1 (en) Multilayered thermoplastic film and sign cutting method using the same
JP3203040B2 (en) Manufacturing method of writing or coloring pencil by triple extrusion and writing or coloring pencil having intermediate coating for protecting core
EP1796892A1 (en) Decorated injection-moulded article, method for producing one such article, and transfer film for using in one such method
KR20020088422A (en) Method of manufacturing a high doi/high gloss multifunctional thermoplastic film
EP3233518B1 (en) Pencil for writing or colouring
CN103547448B (en) There is the multilayer composite of the physical property of improvement
JPH10279766A (en) Acrylic film and molding product using the same
DE69838559D1 (en) CELL AND METHOD FOR FORMING A HARD COMPOSITE MATERIAL AND HARD COMPOSITE MATERIALS MADE THEREFOR
JP3287315B2 (en) Acrylic film for simultaneous lamination of injection molding
DE3751288T2 (en) Labels and their use in plastic containers.
US5244297A (en) Process for manufacturing pencil by tri-extrusion and the produced pencil having an intermediate protective casing
JPH0288338A (en) Decorative molding for car and manufacture thereof
JP3058023B2 (en) Decorative sheet and method for producing the same
KR910000346A (en) Coextruded Synthetic Resin Structure and Its Manufacturing Process
JPH09216269A (en) Co-extrusion building exterior decorative material
JPS6032843A (en) Steering wheel
JP2000213152A (en) Synthetic resin floor material and manufacture therefor
CA1173877A (en) Composite moulding system
JP3767215B2 (en) Makeup sheet
AU2013205931B2 (en) Mud Flap with Indicia
JP4475290B2 (en) Method for producing embossed decorative sheet
JPH09216268A (en) Co-extrusion building exterior decorative material
JPH1142756A (en) Embossed decorative sheet
JPH04325244A (en) Surface protective film

Legal Events

Date Code Title Description
AS Assignment

Owner name: CONTE, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOCHOY, LUDOVIC;BAILLIEU, HELENE;BACHELET, JACQUES;AND OTHERS;REEL/FRAME:012768/0868

Effective date: 20020315

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12